>largest quantum computer that exists today contains less than 100 qubits The numbers reported in the press are physical qubits not logical qubits. You need m

>largest quantum computer that exists today contains less than 100 qubits The numbers reported in the press are physical qubits not logical qubits. You need multiple physical qubits + error correction to create a single logical qubit. The main type of error correction used today is something called "surface codes". With this type of error correction it's estimated that MILLIONS of physical qubits will be required to create a SINGLE fully error corrected logical qubit. https://www.ncbi.nlm.nih.gov/books/NBK538709/ https://www.ncbi.nlm.nih.gov/books/NBK538709/ We do not have actual quantum computers today and we don't seem to be much closer to having them than we were a decade ago. What we have are really interesting quantum science experiments that get misrepresented by the press (and a handful of companies with a commercial interest in doing so).